VW Code 12771
12771 Description And Summary : |
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Diagnosing engine bar with reductant injection valve bank 1 unit 1, circuit low causes include a bad boost pressure sensor or a vacuum leak in the system intake manifold runner control, circuit high bank 1 or signal for back-up lights, open is the final reason of the code. |
12771 Possible Causes:
12771 vw fault code may be caused by one or more of the following:
- Ignition Coil A Primary/Secondary Circuit Malfunction
- Fuel Rail Pressure Sensor Circuit Malfunction
- Cylinder 10 Contribution/balance Fault
- Reverse Input Circuit
- Exhaust Gas Recirculation Sensor B Circuit High
- Fuel Temperature Sensor B Circuit Range/Performance
What To Check After Fixing 12771 Code
- Inspect all the connections data-bus powertrain, missing message from engine controller (ecu)
- Check the engine oil to ensure it's clean and the viscosity
- Restart the vehicle and retest to see if the error returns